Would have to use the past tense here, "collected."
In the past, I have collected...
--books (still have them) approx. 2,500-3,000 hardback titles.
--old paper money (Indochina, Thailand, Vietnam) sold all
--Royal Doulton figurines (sold some; still have around 20)
--various childhood collections not worth mentioning here.
Right now I'm just trying to pay my bills then collect enough $ for retirement... B-)