[Orihime nods, following his instructions as she carefully examines the card. It doesn't seem particularly high or low, so no one of extreme height. That rules out Rex and Gongenzaka.]

And you received it just this morning? I got a package too, and so did Tatsumaki-chan. The handwriting might be the same...it definitely seems similar but I don't know for sure.

It's weird, though. This person must really want you to figure out who they are!