# Packages with old hazmat markings or stickers (reused boxes) — Postal shipping restrictions by item category

For Packages with old hazmat markings or stickers (reused boxes), carrier is USPS; restriction type is hazmat noncompliance fee risk; scope is online marketplace seller shipments (Poshmark); conditions is Reused boxes with old hazmat labels will be flagged even if item inside is not hazardous; seller must remove or fully cover any existing hazmat markings before shipping, recorded from its source on 2026-08-04.

- **Item category:** Packages with old hazmat markings or stickers (reused boxes)
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** hazmat noncompliance fee risk _(our reading, not quoted from the source)_
- **Scope:** online marketplace seller shipments (Poshmark) _(our reading, not quoted from the source)_
- **Conditions:** Reused boxes with old hazmat labels will be flagged even if item inside is not hazardous; seller must remove or fully cover any existing hazmat markings before shipping _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> reused boxes with old markings — even if your item is harmless, a box with an old hazmat sticker will be flagged

## Source

- https://blog.poshmark.com/2026/07/09/59935/

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).