Cause I can’t find any.
I guess you bought way too many keys huh?
AFAIK, Rocket League crates won’t be tradable for another 5 days or so. Any tradable items get locked to your account for 7 days.
I actually only bought 5 but getting crates takes so long. I used them all now though.
That’s only for keys and items that you got from opening crates.