My friends are getting 5 free sterling treasures a week and I only got 3. What gives?
They got one in each characters postmaster (3) + Weekly Crucible + PoE
Once they opened the "free" sterling treasure from the postmaster it will no longer appear on their other characters.
It is always like this when bungie sends a "gift" to your postmaster. It will appear at the postmaster on each character. Once it is opened by a character it will no longer appear at the postmaster on the other characters.
I hope this helps.