I too am awaiting a coin of Gallienus I ordered in late November.
Communication and responses have always been prompt - usually only an hour or two, which is impressive considering difference in time zones and how many times I have neurotically messaged him.
I’ll continue to wait, and I will not leave bad feedback, as: 1) this man is not a con-man, 2) sometimes circumstances are beyond anyone’s control and 3) I believe he will make it right, one way or another.