yes, for any details regarding what you read here would be a good area to ask them, it'd be easier to go over your collective findings here.
The report reads that the pilots were private shipping pilots, there aren't any specific details on them though. The plane was (Crunch wise) an Ares Dakota. General information wise, or common practice, is using 4 pilots that swap shifts for long haul multiple layover cargo runs, this aircraft is capable of short takeoffs and landings on the most basic of runways so it can operate and take off from very remote locations.
Your arrival time is up to the pilots, though at top speed the flight would take a little over 6 hours, in good weather, while there aren't any major storms along the flight path it is very windy, but the flight path should take you under most radars and disguise the approach. The aircraft signature profile is extremely low, so even if you do end up within range of any sensors it would be difficult for them to pick up on your vehicles.
Because it is winter it is only light for about 4-6 hours every day between 8PM to 4 AM, with mostly only twilight levels of visibility. That is without the cloud cover which is currently quite extensive. So your approach will very likely be under cover of darkness.
The client claims to be commercial entity though their actual personal details are unknown to you and by extension TriSeq, all information was relayed to them by a representative. The fact that it took them 2 days to ask for help indicates that they may have already attempted to resolve the situation its own, or more likely, they spent those 2 days weighing their cost options and have decided to hire someone to deal with he situation.