they already have a bitcoin client and private key. they moved the silk road funds to it.

but i still wonder what your actually asking..

1. you want government to own bitcoins?
2. you want to make a random donation to them?

i thought they already had enough funds with fiat. why give away bitcoin to them, its rare remember. you might aswell give all your gold and silver jewelry to them for no reason. i would also say your house, but the way mortgages work, they already own your house.