It's not a unique opportunity in any way, if the German government somehow decided that it would be awesome to hold $2B or $20B of BTC, they can simply buy it at any time.
Right now. As the supply dwindles, the ability to supply that demand will decrease dramatically. If you got it for free in a seizure, there's zero downside to just hold it and forget it until later (when, ironically, the government sends your own fiat currency into a hyper-inflation event).