Unclaimed card backlogs are the bureau's biggest problem. DO notify the bureau of your new call as you upgrade. Please send SASEs with new call, in addition to SASEs with old call. DO notify the bureau in writing if you don't want your cards. Overseas delivery is very slow.
Many cards coming from overseas bureaus are over a year old.
DON'T send your outgoing DX cards to your call-area bureau. DON'T send SASEs to the ARRL Outgoing QSL Service. 4W7 Yellowknife, NWT X1A 2K9 VY1 - Yukon Amateur Radio Assn. These bureaus sell envelopes or postage credits. Send a SASE to the bureau for further information.