>The basic idea is that there should be some way some
> person can identify and locate the left over tool

Metal detector ? You could build a very simple one from
a kit. A tool big enough to hold would be picked up easily

RFID ? Tag the tools and then either scan the room or
install a loop around the place that will beep if there's a
tool in range

In either case make sure you haven't got tools in your
pockets or you'll be forever wandering around the cabin

Reminds me of the pin head who tried to shoplift a very
expensive suit. To avoid detection, he put the security
tags in the pocket. I'm afraid they still work in pockets

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