If it is from the hack and someone is trying to launder the coins they could:

Give away first 1000 coins.

Observe fallout - police interest in recipient, recipients ability to sell coins etc.

If fallout is negligible then do the same again saying it will be a weekly thing but this time send to an address of their own that they have posted in amongst the ever increasing number of addresses.

Repeat in subsequent weeks.

I haven't posted an address by the way - seems wrong as it's other people's bitcoin that should be returned.