Ques. about the astromy trophies on millsberry?

I have 3 accounts on millsberry and on every single one i collected all of the peicse and put them in my house. last week i got all of the bronze trophies. today i found the gold trophy in all of my buddy's stuff....I didn't even go to the clearing or anything. I want to know how I get the silver trophy...or if I even can. did anyone else get the silver trophy??