Bought Penumbra collection: How do I re-obtain it?

[Mudbill]

I don't think you can actually search through PayPal itself, because they seem to delete your old archived receipts and such if they are older than 3 months. You're better off searching the email address you have signed up with PayPal. Unless you disable it (dunno if possible), then you should've gotten the receipt as an email as well.