It seems like it's only been spawning at a handful of monuments nowadays, so I did some /dtevent tests and this is what I got.

[Oxide] 15:08 [Info] [Dangerous Treasures] Harbor (K20)
[Oxide] 15:33 [Info] [Dangerous Treasures] Satellite Dish (M12)
[Oxide] 15:59 [Info] [Dangerous Treasures] Satellite Dish (L12)
[Oxide] 16:16 [Info] [Dangerous Treasures] Harbor (K20)
[Oxide] 16:16 [Info] [Dangerous Treasures] Satellite Dish (M12)
[Oxide] 16:16 [Info] [Dangerous Treasures] Harbor (K20)
[Oxide] 16:17 [Info] [Dangerous Treasures] Sulfur Quarry (G19)
[Oxide] 16:17 [Info] [Dangerous Treasures] Satellite Dish (M12)
[Oxide] 16:17 [Info] [Dangerous Treasures] Harbor (K20)
[Oxide] 16:17 [Info] [Dangerous Treasures] Satellite Dish (M12)
[Oxide] 16:18 [Info] [Dangerous Treasures] Harbor (K20)
[Oxide] 16:18 [Info] [Dangerous Treasures] Satellite Dish (L12)
[Oxide] 16:18 [Info] [Dangerous Treasures] Sulfur Quarry (G19)
[Oxide] 16:19 [Info] [Dangerous Treasures] Harbor (K20)
[Oxide] 16:19 [Info] [Dangerous Treasures] Satellite Dish (L12)
[Oxide] 16:19 [Info] [Dangerous Treasures] Satellite Dish (L12)​

The only monuments I have blacklisted is Outpost and Bandit Camp

Hey, thanks for the report. Fixed in the new update, with a couple other things as well :)