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[voxprincipalis]

Are you sending them as flat/large envelopes? Large envelopes take a different rate than regular envelopes. Perhaps the first time you were there, the postal worker weighed the envelope but accidentally told you the regular first-class mail rate rather than the large envelope rate.

A 2-oz. piece of regular first-class mail, in a standard letter envelope, would cost $0.59, which could be accommodated with two first-class stamps.

A 2-oz. flat envelope costs $1.00, for which you would need three first-class stamps.

VP