Trailer seals match bill of lading, bulk delivery hoses capped or housed so as not to become contaminated in transit. Your procedure should highlight checking of any bulk reception screens, magnets, before and after delivery. Also your COA should always match delivery paper work for lot#. Procedure should include that your delivery hoses never touch the ground. Ensure your Food Security as well. Make sure the procedure states that your receieiving inlets are secure before and after delivery. Not sure what attributes you track in your bulk flour, but we have certain requirements placed on our suppliers. Things like protein, ash, and stability must meet our minimum specs, if they don't you should have corrective actions up to including refusal of reception. These specs are supplied with our COAs. We get our COAs through TraceGains before the trailer leaves the mill (most of the time) and this is included in our all of our receiving procedures. This may not be just what you asked for, but I'm on mobile away from the office. Hopefully this will help you get started in the right direction. Good luck
All that, plus if there are filters/screens in the system have a check of the filter/screen prior to transfer and after transfer. Obviously, the filter/screen should be intact, clean, and free of debris both times. If not, you need to take appropriate action.
Is there more than one potential receiving location (multiple silos)? Are multiple types of flour stored in different silos (all purpose, whole wheat, high gluten, whatever)? Have a check to be sure you are hooked to the correct silo prior to transfer. Even if there's a single type of flour in multiple silos it's a good idea as you may only have one silo with enough space to receive the incoming load, you want to have appropriate rotation of stock, and stuff like that.