I received social security number on ********,but I have been waiting for the work ID,i...

I received social security number on ********,but I have been waiting for the work ID,i later submitted application upon waiting over three weeks.*The acknowledgement time line was *********.I got a mail on **th it stated (Our records indicate that January ** **** a card was produced and sent to the address on the file at that time. You have not notified us you have not received it and the post office has not returned it to us)*You need to file a Form *-*** ,Application for the Employment Authorization to replace your lost document.*Furthermore,I went to post office on Springfield Ave,today ******** with my proof of Address with letter mailed to me, the customer service representative required for a tracking number, which I didn't have but always check throughout but found nothing related to a letter from USCIS address to my name.*Kindly assist