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Disposable security envelopes are designed for controlled storage or transport of documents, cash, mail and valuables. Disposable envelopes. Cannot be reused. Markings on security envelopes: Field for inserting a description (sender, recipient and additional information), sequential numbering, also in the form of a code. Additional coupons (two) with repeated numbering special perforation makes it easier to tear off the coupon. Printing on the edges in order to prevent resealing, attempts to open the security tape result in displaying the words VOID and STOP or the tape delaminating.