Board Thread:Game Discussion/@comment-203.206.28.81-20130523073308/@comment-1964873-20130523222255

136.166.44.135 wrote: Despite rumors to the contrary, episode medals still do have a small chance at dropping the x3/x5 cards and their weapons. If you don't use them to upgrade your cards or cash them in for credits, they will convert to regular medals (of the same type) after the episode is over.

If you've seen it, then I can't refute it, but I've cashed in over 1500 gold medals (probably closer to 2000, but I didn't keep track of all of them, and I can't even begin to guess how many silver medals) and have yet to even get 1 part of the x3 from them.