There is a new faster version of checker available now, and using it we have searched the SF grid completely for 17-clue puzzles. The total number found was 29. gfroyle found 29 so this means he found all of them (which everyone suspected).

The old checker estimated the search of SF for 17s would take several months. With the new checker it took 6 days.

I picked a random grid from gfroyle's list

286537941541982736379614258917358624452176893863429517625743189194865372738291465

and searched it for 17s and found exactly one:

000000041500900000070600000000350600402000000800000000000040080090000300030000000

The search took 3 hours 20 minutes.