Example, Torch:
Search 1;2;500::100 (48bits + 48b +4b)
This usually has few search results, then by simple reasoning and trials and errors, you find the right one, let's say 9CADC750 = 1, ##80 = 2, ##B0 = 500, then ##E0 should be 1 the quantity, you can change it to 100 0, 1k, or whatever.
If ##E0 isn't 1, then you're in bad luck, this thing is broken into two pieces. Then, you should restart the game and try again.
You can search 1;2,500;1::148 at the beginning, but then it's very likely that you get a lot more search results. At the end, it'll take more time to find the right one.
[added 4 minutes later]
Why bother?
Cheat the crafted quantity of Chlorcystamine, say get 1k or 1kk instead of 1, then trade in Chelyabinsk.
If you can't or don't wanna get that far yet, cheat some Torch.