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Thanks. I know I should mail to 

Internal Revenue Service,
Austin, TX 73301

However, the UPS employee said that when he enters this zip code on their computer system it changes automatically to 73344. The UPS employee said this address is OK for delivery. 

It has been 2 months since I mailed, and I have not receive my tax return and there is no change for tax return status online. So I wonder whether this address can deal with my tax return.