That's a toughie I sold exactly that spec and year, complete with the extra TEC pack.
Mine was new in Jan 2019 and was above standard spec (Pike Ultimate instead of a Revelation). I sold it via eBay in Aug'21 for £2950. It had 3150 miles on the clock. I was selling the TEC pack separately, but the buyer of the bike bought it for £250. Total £3200. I considered myself lucky to get that, the pandemic was still on and the demand for bike of all kinds had rocketed.
I would recommend selling them separately as there seems to be a high demand (or at least there was) for TEC packs.
I normally tell myself that bikes depreciate at 30% per year. But that was mtbs, not emtbs. You are going to need all sorts of documentation about the motor and battery health. But don't forget that not everyone is as clued up about ebikes as we are on the Forum. My buyer for example. He was going to use the bike for commuting in London and didn't even want the hard compound tyres that I was also selling. I have no idea how he got on with the grippy 3C tyres that were on the bike, because he never got back to me with any comment, good or bad. Just a very praiseworthy comment on eBay.
You can no longer sell ebikes of any kind on eBay, so you can no longer test the price on there either. All a bit of a bummer. There must be other places, like Pinkbike Classifieds?
What the buyer of mine liked was two things: One was that I had a complete history and maintenance record of the bike and had showed all the things that were not perfect about it (in addition to the usual big-up).
The second was that I had arranged for collection from my LBS. They had done some work on the bike and they knew that I had looked after it. I left the buyer alone with the LBS guy and they chatted.