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Mail bombs have been contained in letters, books, and parcels of varying sizes, shapes, and colors.
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Letters feel rigid, appear uneven or lopsided, or are bulkier than normal.
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Oil stains may be present on the wrapper.
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Use of excessive amount of postage.
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The sender is unknown.
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No return address.
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Unusual restricted endorsements such as "Personal", "Private", "to be only opened by..."
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The addressee normally does not receive personal mail at the office, or the package was unexpected.
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Name and/or title of addressee are not accurate, or a title is listed but no name.
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Address is prepared to insure anonymity of sender (i.e., homemade labels, cut and paste lettering).
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Mailing emits a peculiar odor.
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Mail appears to have been disassemble, reglued, or excessively secured.
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Handwriting appears distorted or foreign.
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Protruding wires, tinfoil, or string are present.
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Pressure or resistance is noted when removing the contents.
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Outer container shape is irregular or asymmetric or has soft spots or bulges.
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Wrapping exhibits previous use such as traces of glue, mailing labels, return addresses or tape.
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Several combinations of tape are used to secure the parcel.
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Unprofessionally wrapped parcel is endorsed "Fragile-Handle with Care" or "Rush-Do not Delay."
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Package makes a buzzing or ticking noise.
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Contents of parcel make a sloshing sound.
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Mailing is postmarked from a place to which you have no connection.
