ID's adding up to 17 or 23 are really not that that rare.
10,000 four digit numbers. Range of their possible sums are 0 (0000) to 36 (9999). The middle of the range is more likely than the extremes because there are more way of making those numbers (pic related).
Of those 10k possibilities, there are 660 ways of making 17 and 540 ways of making a 23. So 1200 in 10k, or 1 in 8.33, ID's with 4 non-hex digits will add up to 17 or 23. For 2 given IDs the odds of both being are 1 in 8.3^2=69. Not that remote. 6 in 10 digits will be A through F, three fifths of all of them. So this is pretty close.
The odds of an ID ending in dubbs is one in 16. The odds of a second ID ending in the same two digits is 1 in 256. So the odds of both ending in the same dubbs is 1 in 16x256=4096. More rare.
But, this isn't the only thing to consider. If you first decided on what rare thing to watch for and second went out an found it, then this would be significant. But there are many, many rare things that can happen that would get your attention… so many that they are bound to happen fairly frequently just by dumb luck.
Yes, I know this is stale old slide-bait. But it resembles many similar types of numerical autism. If I can parry this attack into showing them how to think about these things then this bot may be worth engaging.