Hi I have been trying to get this resolved for a few weeks now and then got a reply to add here:
With the new TMNT release I purchased on 2 occasions a Mythic pack using coins earned and in the one case received "Donnie's Bo" and on the other occasion " Ralph's Jitte" both were borderless and looked amazing. I then contacted support to try and find out why they are not in my deck when I searched for it, I did try the Collected / Not Collected the different game formats everything but it is still no where to be found. I then did download the log files to share with the team, I also tried repairing game files but nothing worked. The last email from support suggested I try this avenue so here we go. I am playing on Steam via PC. You can check Incident 5031563 and the first time I raised this was March 6th for Donnie's Bo and then again on March 8th for Ralph's Jitte.

My worry is this might have happened in the past And I did not notice since I generally play with only 2 colors so please can you check or do an audit on all cards I purchased/received if they are in fact available to me thanks.