custom duty query/ about invoice

ASK YOUR FRIEND FOR SEND IT FROM DHL COURIER.

https://www.dhl.co.in/content/in/en/contact_center.html

Sir, he's sending via usps priority mail international. he will mark it as a Gift.

will there be any problem if he doesn't sends the invoice?

he has to provide a declaration regarding "commercial price" as USD 75 and declare that its sent FREE OF COST as GIFT, for reference he can attach a copy of invoice, to satisfy the needs of customs valuations. 

rem the invoice is not of sender but of some vendor in counrty of sendor to the vendor, so its only reference document, for your above query "invoice is to be raised by sender" to catagorize it "commercial ( non gift)

thanks for ur reply Mr. Sharma.