Package sent to Australia

[Lilhelp]

My husband and I have applied for adjustment of my status- with concurrent filling. It was delivered 20th September to USCIS. Here in the US we haven't got a text, email or letter. But a week after it arrived in Chicago, my address in Australia revived a huge package from USCIS
I have no idea what this is.. Could it be my package sent to Australia unprocessed for some reason?
Please help if you know anything.. Thanks!