Slimline Push Button Lock Box

[Libertyclicks]

We had these push button lock boxes installed at my work to hold spare access keys for part time staff to unlock the building with. Here is the lockbox itself which has the mechanism on it.

thebox front locked.jpg

It's mounted on a wall with a backing.

slimlineonwall.jpg

Naturally I was intrigued by them and decided to have a go at it.
I'll cut to the punchline and if any cares about the process I will post more info.
So , the "OPEN" tab is slid down when you have the correct combo punched in to retract the bolt at the top of the lock box. The OPEN tab will move even if you don't have the correct combo, but the bolt will not retract.
The OPEN tab is mechanically linked to the RESET tab, so when you slide the OPEN tab down the RESET tab slides down as well. Like so:

leverup.jpg

lever down.jpg

This was the locks undoing.

So how it works:
Slide down the OPEN tab as far is it will go, keep your eye fixed on the RESET tab. Push and hold a combo number to test it. It will not depress all the way, but hold it as far as it will go. Release the OPEN tab and note any change in position of the RESET tab. On a number that IS NOT used in the correct combination the RESET tab will not retract upwards at all. The RESET tab may move left or right if you switch which bank of numbers you are testing (left side to right side, or right side to left side). On a number that IS used in the correct combination the RESET tab will retract upwards slightly.

no 5 down.jpg

no5 up.jpg

no2 down.jpg

no2 up.jpg

In this example, number 2 and number 5 indicated, as well as 2 other combo numbers. That narrowed down 16 combos, EDIT: I was just playing with this lock some more and found out ANY ORDER will work as well, as long as the correct 4 buttons are pushed.

theboxback unlocked.jpg

Mechanical Locks FTW. I searched these when I got home and found that: "This strong box design has a solid track record for unmatched quality and security."

LibertyClicks

[GWiens2001]

Very nice, LC. Clear and concise, easy to follow.

Gordon

[femurat]

Congrats for figuring out such a simple and easy trick!

Cheers

[Oldfast]

Nice job! This method looks promising. I never had much luck with mine... just ended up with sore fingertips. lol

I'll have to dig it out and give this a try. I'll let ya know how it goes (if I can find it). Thanks for sharing.

[rerun12]

just got my supra push button series 3 (older model) open by using the method ive copied below. kinda the opposite attack as suggested for the newer model. pretty cool, took all of 1 minute:

ok here's a trick for opening certain types of "SUPRA" key boxes--for
those of you that don't know what a supra key box is they are the boxes
on the outside of buildings and they contain either a master key or a
sub-master key for that building--they are there for the fire dept so
they can use them in case of fires--anyhow--the supra boxes that have
the push buttons and a reset button that is narrower then the "OPEN"
button can be opened simply by 1st pressing clear,then press the #1
button now press and hold the open button then press clear--the button
will either stay down and not move or it will make a clicking sound and
pop back up--repeat this procedure for all of the buttons--keep track of
the buttons that click and pop up for those buttons are the numbers in
the opening code---now all you have to do is enter those buttons

[UnlockD]

Your method worked beautifully. Took me about a minute and a half to crack mine. Thanks for the knowledge.

[rerun12]

No problem! Not my method but I did do some searching for it. Glad I could help someone out on here for a change!

[huxleypig]

Yes, this is a great technique! The one about them clicking back up or not is good too. We have a lot of those mechanical push button locks too here (not the key keepers but we got those too) and they can be decoded too.

It's so much fun!

[felipeferras]

why is not working for me
the only number will retract the clear button are 9 -4 -3 and the combo does not work

[Mikeh727]

why is not working for me
the only number will retract the clear button are 9 -4 -3 and the combo does not work

I would check to be sure that another number or two doesn't give just a very slight indication. But you can also try brute force at this point. Use the three numbers you have in conjunction with each of the other numbers. If just one additional number doesn't work, try two. Since the order doesn't matter, this really shouldn't take too long to go through the possible combinations.

Also, be sure you're using the correct method. There are two on this thread. Only one of them worked on the one I tried. Try both methods to be sure.

-Mike

[Norseman]

I just made a litte video on this cabinet.... Go figure...
Hope my tips can be of any help..

http://youtu.be/8bzolgrC6BA

[MrWizard]

Dang I don't even have one to try any methods on.
So now I have to get one just to try this out.

[Mikeh727]

I just made a litte video on this cabinet.... Go figure...
Hope my tips can be of any help..

http://youtu.be/8bzolgrC6BA

Thanks Norse. Nice video!

-Mike

[rohare]

Nice job! I tried my hand at one of these and ended up dismantling it when I couldn't get anywhere. Even after a pretty thorough analysis of the guts I still didn't have any success. The simplicity of your manipulation has humbled me

[grit1]

If anyone is interested, I did an Excel spreadsheet with a rigorous list of all possible combinations for these locks. The numbers are interesting - the most combinations are in the 5-number band. I can E-mail my file to anyone interested.