USPS delayed

Hello everybody:

I sent my DACA renewal on July 1st.

USPS tracking: 70160910000017276489

It shows delayed, I have contacted USPS several times, and today (Monday July 13th) I finally received a call from them, yet they don't provide a solution as of today.

My questions are:

1. When do I send a replacement renewal application?
2. If I use UPS do I need to request signature confirmation or other proof of delivery?
3. Can I cancel the money order on the first apparently lost application?

Thank you for your help.

Did you use express or priority mail?

I used first class mail with certified mail service, just like I did with my initial application and previous renewal.

I need help please, I think I have to send another application because it is likely that USPS lost it. What happens if my first application suddenly gets delivered and USCIS receives two DACA renewal applications?

Send another. Don't waste time.

For future reference use USPS Express 1-2 day delivery with signature required.

It's a $22.95 service which is cheaper than UPS/Fedex.

Don't ever use first class mail with something that you do not want lost.

Check again, looks like your package was delivered yesterday 07/15/2016!

Yes, I checked, the package was finally delivered.
I guess calling USPS several times proved successful.

Thank you all for your help.