[TophWells]

Sometimes, yes. Not always - it depends on how the transactions inside the wallet are organised, which is not usually displayed unless you go looking for it.

Not that it matters - if 100BTC go into a wallet, and an hour later 100BTC comes out of that wallet, it's fairly irrelevant whether or not they're the same coins.

[PeterisP]

Well, it does matter - if 100 stolen BTC go into a wallet that has 900 BTC already, and then 1000 deals of 1BTC go out to different wallets... then you blacklist and seize all 1000 outgoing BTC or some arbitrary 100 BTC or some specific (how) 100 BTC?