Currently Sosa hasn't been online on Dream (don't know if he vends elsewhere) in the past 3/4 days. Several people, including myself, haven't received our packs from last week. Normally only takes a few days for his packs to arrive. Other people have said they received their orders, while others haven't. I don't know if he is selective scamming or his packs have been profiled/seized, but don't order from him until then. Hopefully just issues on his end and things get fixed, but only time will tell.
Edit: so my pack finally arrived today. Sosa still hasn't logged on, so I wouldn't order from him until later. But people still waiting, there's hope.
Seems like I've seen this same story recur every couple of months since he first started selling stamps on evo.