thank yous for people at work

as you may remember yesterday my co-workers threw me a shower...now some of them I have home addresses for and some of them I don't...

the ones I don't shold I just mail them a TY at work or ask for their address?

TIA

I just put them in their office mailbox for everyone. It was easier and cheaper for 28 thank you's.

That's a good idea but we don't have office mailboxes but maybe I can get the Mailroom to deliver it to them when they get their regualr mail

thanx