Buy it, use it, break it, fix it,
Trash it, change it, mail - upgrade it,
Charge it, point it, zoom it, press it,
Snap it, work it, quick - erase it,
Write it, cut it, paste it, save it,
Load it, check it, quick - rewrite it,
Plug it, play it, burn it, rip it,
Drag and drop it, zip - unzip it,
Lock it, fill it, call it, find it,
View it, code it, jam - unlock it,
Surf it, scroll it, pause it, click it,
Cross it, crack it, switch - update it,
Name it, rate it, tune it, print it,
Scan it, send it, fax - rename it,
Touch it, bring it, pay it, watch it,
Turn it, leave it, start - format it.
Technologic.
Feel free to use and abuse them as you see fit, so long as they don't conflict with the existing rules. Upgrading them is allowed, moving stuff in them is allowed too. It's not map breaking as really you can just shove it in your inventory and make a few trips otherwise.
However, you can choose to eschew my words and make it all the more challenging for yourself by only using chests and instead making a pile of strongboxes. It is up to you where you make your strongbox pile, but I want you to take screenshots of your strongbox pile and share it with the world! This, is the Strongbox Challenge! The most impressive pile of strongboxes I might even show off on the front page, so eternal glory can be yours! Or something.