IF you intend to dump without searching, with the illusion you are going to get silver spit back out: might as well order your coins right at the TD bank, open them up right in the lobby, then dump them in the TD coin counter, redeem your coin, and order again. Repeat on delivery dates.
I don't know about TD, but silver does get coughed out occasionally, but if you keep trying to put it in, it will take it.