Watering cans of death (Kendal LA9)

Ok, I'm asking for a new watering can, but already have 3 I'm offering on Freegle. Why? The problem is that I used one of the watering cans to put weed killer in, and now I can't tell which one it was. The cans lack nozzles but are otherwise sound, only I don't want to risk using them in case I kill off my plants. If you want to take the risk, or need one for weed killer and are sure you could tell them apart from your regular can, please take them. All, or just one, as needed.