used, should be placed in an area above the address (figure 3-4). Unauthorized Markings Unauthorized markings are markings that do not designate the rate of postage, class of mail, mailing address, handling instructions, content, or the special service  requested.    Unauthorized  markings  are  not permitted to appear on articles presented for mailing. Obsolete markings should be covered or obliterated. Containers improperly identified as to content are not acceptable (for example, a box marked as containing cornflakes that actually contains flammable liquids). Imitations of postage stamps, in adhesive or printed form, or private seals or stickers that are like a postage stamp  in  form  and  design  should  not  be  placed  on parcels  accepted  for  mailing.   Decorative  markings and designs, in adhesive or printed form, that imitate the  markings  and  designs  used  to  identify  official postal services (see figure 3-5) should not be placed on 3-6 MARKINGS AND ENDORSEMENTS FOR MAIL CONTAINERS BY CUSTOMERS Marking Applicable To Items Marking is Mandatory Fragile Containing delicate items such as glass, and electrical appliances. Yes Perishable Containing products that decay quickly, such as fresh fruits and vegetables. DO NOT BEND Only when contents of container is fully protected with stiffening material. No DO NOT FOLD DO NOT CRUSH Return Receipt Requested Must use the wording or label required by the special service standard. Yes Special Handling Table 3-2.—Markings that may be placed on articles by customers PCSN JOHN R DOE USS SHIP DD-966 FPO AE 09533-0001 Figure 3-4.—Area for placement of special service endorsement. Area for Special Service Endorsement JANE B DOE 1776 AMERICA ST WASHINGTON DC 20020 CLASSIFIED DELIVERY PCf0305 Figure 3-5.—Examples of labels that may not be placed on articles to be mailed.