[joli160]

There are a lot of modified dials with added Tiffany logo. Lots of sellers try to catch a piece of the pie and hope for some ignorant buyer willing to pay a premium. Obviously the modded dial watches come without box papers, how convenient ...
It's also worth checking the serial number to find out if all is within the known Tiffany range.
Not having the correct papers does not automatically mean these are not correct, some people throw those away, but there is no way you can ever prove it.

If you are really set on buying a correct complete set expect to pay top dollar and source through well known vintage dealers. Forget about anything else, you will find it very hard to resell a possible modded watch in the future.