Itβs in a cupboard, tight fit at the top so no access there eitherWhat about above? Pry the top off and drop a wedge down?
Disc cutter in a house wont be a fun time
As requested.Upload a picture and ill tell you were to drill it.
I open safes for a living and regularly do work on gun cabinets. I'll probably be able to tell you were to get replacements from incase you want to use it.
The other destructive way is good recp saw metal blade and a cone (or step) drill bang 4 holes in and cut the corner out.I have done a couple, easiest way is with a 9" angle grinder with a thin steel cutting disc..
I have tried the 4/5" angle grinders yet some lock bolts are further back, and usually, and are made from a higher carbon steel, which cant be cut with a jig saw.
The other way I did it was buy using a hole saw, and then a using a good pair of tin snips, and peeled it open like a can of beans, this was by far the easiest way with know mess!!

Angle grinder with thin metal cutting disc, straight through the gap adjacent to the key holes, once open unbolt, then buy a couple of new locks from ebay/amazon, refit and you have a cabinet for the shedAs requested.
Can you actually see the hinge pin in the top left corner?As requested.
Not sure if you have the tools or if you have the space to get in.Hi All
Any advice on best way to access/remove a locked gun cabinet with no keys present?
Cheers
MD
No because most of the ideas have come from the Cracker Jack boxAre we there yet?
David

Can see the pin on mine, would be pointless cutting it though as thereβs a return fold inside that would prevent the door opening from the hinge side.Can you actually see the hinge pin in the top left corner?
Wondering if you can, as it is obviously an old cabinet, as it was already installed and locked when you bought the house 10 years ago.
Surely not?.....
That is what I suggested.Not sure if you have the tools or if you have the space to get in.
Could you try getting a recip saw with a long blade behind it cutting the raw bolts then grind or gas axe it outside
I've got a couple of similar looking cabinets around the property.As requested.