Did you tried any other means of communication with them apart from bitcointalk? Because the profile clearly states Last Active: February 15, 2019, 03:01:37 AM. It's almost been two months since they're last active. Maybe they're busy in personal life? I hope you establish another means of communication with him and sort this out.
Unfortunately, no. I don't have other means of contact.
I can try the good old letter in the mail, since I have his details on the customs letter but to be honest I haven't thought of that and would rather not resort to that.
Also when you are PMed, by default you receive an email with the content of the PM, so it is really pretty much like an email.
I PMed him on :
December 20, 2018, 01:55:07 AM => Tracking number is wrong, no reply.
January 07, 2019, 10:03:33 AM => Annoucing that custom held onto the package and I need some info, no reply.
February 01, 2019, 07:16:10 PM => Announcing that parcel is on it's way back, got a reply that I shouldn't worry. "I will make sure we come to a conclusion that makes you whole one way or another."
February 14, 2019, 02:43:56 PM => Asking for news about the parcel, no reply.
March 15, 2019, 11:58:10 AM => Asking for news, considering scam report, no reply.
March 26, 2019, 04:31:01 PM => Asking for news, considering scam report more seriously, no reply.
I usually tend to not be too demanding / too protective with people I assume can be trusted by default.
Anyone can be busy in life, I understand that, this is why there was quite some time between PMs.
But when trading, to no reply for months is pretty much deceptive.