Just curious, but what have you found that's good in those containers? I raided the docks a few times but other than a recharge of pepper spray and some cash, there was nothing interesting to be found.
Prior to the latest update, it was just for TV parts ($400 Stolen Goods), Pink Swirly Vial ($1200 Stolen Goods), Gold Bar ($3000 Stolen Goods) or Fertilizer (unless using mods, costs $1000 if you run into it at the 30 Minute RNG Markets). There is also the chance to get the Catsuit, which helps reduce Crime gain just like the Long Leather Gloves (has the Stealthy clothing trait).
After the latest update, in the same container as where you find the Catsuit, you can also find some 'mechanical parts' in boxes marked with a peculiar symbol that is added into the pool (can only get Catsuit once; if you want more you have to get it from the Forest Shop). These 'mechanical parts' are not only worth $1000 as Stolen Goods, but they also do one other important thing - they reduce Soft World Corruption by 5 every time you steal them. So it means that other than helping Gwylan with their 'ritual', you can raid the Docks and steal these 'mechanical parts' to reduce Soft World Corruption now without needing to join the Temple to do so. You can find up to 0-3 of these 'mechanical parts' per raid, though most of the time you may find either none or just 1.