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5-2 Unauthorized Markings

5-2.1 Obsolete Markings

Obsolete markings (from previous mailings or on reused boxes or containers) must be entirely removed or completely obliterated prior to mailing.

5-2.2 Erroneous Markings

Containers with improperly identified contents are not acceptable, as noted in the following examples:

• A parcel marked "Bleach" that actually contains clothing is not acceptable.

• A parcel marked "ART SUPPLIES" that actually contains a flammable liquid is not acceptable, even if the liquid is technically an art supply like paint thinner. The potential danger of the liquid's flammability must be identified through the proper external markings required by 49 CFR and DMM C023.

5-2.3 Extraneous Markings

Extraneous information (such as order numbers) that can be confused with ZIP Codes may not be printed immediately under the last line of the address.

5-2.4 Other Markings

If other markings are used, such as advertising messages and company logos, they must be placed in areas that do not conflict with the essential information areas described in 5-1.