actually, an excellent example, though misunderstood.
this is more akin to robbing a store where every item has anti theft tags on them, which break open with blue liquid if you force them open. A thief isn't going to force the clerk to deactivate each one, they gotta run and find someone with the deactivator so they can unlock them in safety.
those canisters are going to have way more complex identification on them than that. Everything is tagged and labelled and will be flagged the moment you try to sell it.
"this canister of diamonds was registered to a T9 transport, Mr Asp... how did you get it?"
"uh.... found it?"
"and that T9 reported being under attack by an asp before losing communications."
"uhh... coincidence?"
as pirates you SHOULD be forced to sell illicit goods on the black market, not sell them straight back on the open market. Seriously you're using a mechanic not intended for piracy to justify your laziness and still call yourself pirates? How is that piratelike?
At the the very least you should be forced to go somewhere to reidentify your cargo so it becomes clean and then resell it on the open market.
however that said I'm not that bothered because gameplay mechanics for pirates currently suck and aren't profitable anyway. But you can bet I think that the stolen vs abandoned element is something that should figure in to any piracy revamp that happens in the future