mystery to me

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Hi, I'm new to this board. I work in a bank and try to get a good collection going. Does anyone know why in two bundles of 10.00 consecutively I found FEP3395000 follow by 3395333-3395444 and then back to 3395001................in the second bundle 333 and 444 was again inserted between FEP3467000 and 001.
I kept then but don't know if I should have

P.S. pick up beautiful BEW4222224

They are not replacement notes. Sometimes bundles get mixed up.

They can be Quality Control Insert Notes (QCIN).