Override shipping zip code?

[z-analysts]

VM 1.1.1
Joomla 1.5.4

Is it possible to override the shipping zip code in the USPS shipping module like you can in the UPS module? I am dropshipping my products so the originating zip code is different from my store zip code.

Thank you!

[z-analysts]

I believe I found the answer. In the usps.php file at line 120 replace the existing line with one that sets the shipping zip code:

//         $source_zip = substr($dbv->f("vendor_zip"),0,5);
         $source_zip = "33990";