If anyone does feel like adding this feature, it would be really nice if you could also add something in the relay browser to remind the user how many tools they've found so far, or a reminder to put on a war uniform after all 4 tools are found, or something along those lines.
A few days ago I was lazily playing on a multi and spent a bunch of extra turns after finding the last tool because, when I visited Yossarian out of uniform he asked for the last tool again, which I mindlessly continued to spend turns looking for.
Conveniently enough, I just did the junkyard quest again, and Yosarrian's re-request for the last tool (even though it's already been found) is something that happens in KoL proper, and not just mafia.