Top Flight No. 10 Security Envelopes 500 Count

Top Flight No. 10 security strip and seal envelopes in a pack of 500. White wove paper material with a weight of 24 lbs. Each envelope measures approximately 4.1 in x 9.5 in (10.5 cm x 24.1 cm). A few missing from box but not many. Asking 15.00