@chelseafc what green slip are you talking about? I am having the same issue. I sent 3 weeks before and no receipt, no text message and it's not on their record but the tracking number shows that it has been delivered. I sent through USPS to this address:

U.S. Citizenship and Immigration Services
attn: TPS Nepal
P.O. Box 6943
Chicago, IL 60680-6943

And I did include last TPS approval which was valid till June 2019 and I heard we don't have to reapply. And there was no bar code. I used the application which shows 5/31/2019 expiration because that's what I found on the USCIS website. I am very worried, might have to quit the job.