Ex-RM myself, but can't confirm the AI bit as I left two years ago and never saw that.
Blue bins, even if described as a "safe place" are a no-no. Perfect example is that I used a blue bin for a fairly regular parcel receiver and everything was normally OK, until I blue binned their parcel, not knowing they were on holiday for 2 weeks, neighbour put their blue bin out for them for recycling along with their item.

Got a right bollocking for it, and the sender had to make a claim against RM which RM were never happy about etc, so they never got a parcel left for them again as it's never worth the hassle and/or losing your job over.
Now you could argue, "but I never put my bin out", or "it's locked behind a gate" - it's just a blanket policy so that if the usual RM staff member isn't on that duty due to rest day, sickness or covering other duties then there's no temptation by the covering staff member to blue bin a parcel in the off chance that the item in the bin does get taken, moved, stolen even with cameras. Plus, if there's 2,000 delivery points on a duty, you can't remember everyone's preferences, although the PDA may offer those details now for scannable items.
We even had a Work Time Learning memo of some little scrotes using modified litter pickers to reach into bins to grab items from the bottom, so even with cameras, fences etc it's not a safe place. Lockable parcel boxes and or neighbours you trust were always the better option, or a re-delivery when you're going to be in.