The Postcards for Mom Pranksters

Sorry I haven't posted lately, I haven't been feeling well.
 
Anyway, spoke with Mom the other day.  Mom says she has well over 200 letters, and had to stop writing responses for the letters with no return addresses because she couldn't keep up!
 
Apparently, the initial note from Will said to check the P.O. Box for 3 months, so she knows it will be over then - and she's already getting sad about it!  She says she's trying to make the most of it while it lasts.   And, apparently the people at the Post Office think this whole thing is really cool too - they keep asking her how they can have this done to their friends.  Her response: "I don't even know what 'this' is!"
 
She says she's receiving all kinds of buttons: shirt buttons, button covers, holiday-themed buttons, buttons with slogans, etc.  She's also receiving tons of birthday cards ("I just don't understand - my birthday is in December!")
 
Margaret from Germany sent her a whole package including German chocolate and a pass to EuroDisney (used, I assume).
 
Anyway Mom is still really enjoying the experience, is grateful for it, and hasn't a clue what's going on - except that it's some kind of joke.