New Apple iPhone 6S Boost Mobile

I bought this new iphone 6s from ebay, I was told it was assigned to Sprint, the IMEI number is clean, I did attempt to set up the phone but I could not have it activated with Sprint.

Sprint's Technical support researched this phone and told me that this phone is actually a Boost Mobile phone, the Sprint prepaid version and would need to be activated through Boost Mobile.

This phone is in new condition, plastic on the screen, no damage, original charger, ear buds, manual and box, and never used it because I could not activate the phone with Sprint, however it is being sold as used

No sim card.

Battery Health is 100 Percent

IMEI "3561360965327 xx"

I contacted Boost Mobile, they informed me that this phone has never been activated and is clear to be activated with them.

I was also told to have this phone activated with Sprint, I would need to have service with Boost Mobile for twelve months, cancel, then activate it with Sprint.

I was told that this is not the original box