Bugged Peruvian A/C registration on Kaitak?

Hi I am running an airline in Peru on Kaitak an noticed that the aircraft registrations started from OB-0001 to OB-0012, then all of a sudden it jumped to OB-0405. Where are the missing 392 numbers in between? I checked the fleet list and found nothing.

taken by other airlines and Aircrafts

the first thing i checked was the fleet list but i found nothing…

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There are no guarantees that registration numbers must be sequential. If those 400 numbers had been used before, they might now be discarded or reused at random. So classic “it’s a feature, not a bug”.