· usps
USPS Lost Package: How to File a Missing Mail Search
Submit a USPS Missing Mail search request at missingmail.usps.com between 7 and 365 days after the original mailing date if your package is lost.
Shipping Guides & Tracking Tips
Carrier-specific shipping guides, tracking tips, and problem resolution articles.
· uspsUSPS Return to Sender: How It Works and Why Mail Comes Back
To return USPS mail, keep the piece unopened, mark it as Refused or Not at this address, and hand it back to your carrier or place it in your mailbox.
![DHL Tracking Number Format Guide [2026]](https://uploads.trackingadvice.com/2018/10/Untitled-design-4.png)
· dhlDHL Tracking Number Format Guide [2026]
A 10-digit DHL tracking number belongs to Express, while numbers with letters or 10 to 39 characters route through eCommerce, Parcel, or Freight.
· dhlDHL Customer Service Number: 1-800-225-5345, Hours, and Who to Call
Call DHL Express at 1-800-225-5345 Monday through Friday from 6:00 AM to 7:00 PM Arizona time to reach a live customer service agent.
· ontracOnTrac Customer Service: Live Chat, Text Line, and Hours
OnTrac customer service runs through live chat on ontrac.com or texting 703-348-8441, open Monday-Friday 8 a.m.-9 p.m. and weekends 8 a.m.-8 p.m. Eastern.
Purolator Customer Service Number: 1-888-744-7123, Hours, and Who to Call
Call Purolator customer service at 1-888-744-7123 Monday to Friday 7 AM to 9 PM or Saturday and Sunday 8 AM to 8 PM to resolve your parcel issue.