Same here, I saved mine to show to my kids some day. "Hey look kids, your dad was summoned to a Japanese district court over the loss of 0.0001 bitcoin!"
I got that card and had 0 BTC in my account. I think they sent it to anyone who ever used the exchange, regardless if they had funds in it at the time it fell apart.
Years ago, it stated I was a creditor and was owed some comically tiny amount of BTC I had left in my account. Cool form factor, a sorta sticky postcard sized accordian you would pull apart, japanese on one side, english on the other.
I had like 0.000001 BTC in mtgox and it was worth it for the cute sticky unfoldy postcard thing I got from the Japanese court.