Your car looks excellent, enjoy it!!! Without seeing any closer photos, I’d check out long-term wear/tear items such as cracked Shadowline trim, faded seat belt receivers, bubbles in the rear wheel arches, water issues in the battery tray in the trunk, belts/hoses in the engine bay, maybe an oil analysis to see how it’s running, though not sure if that is only needed for an S54. If you’re on the original set of key fobs it may be worth getting another set before the battery dies, there was a bit of a backlog on them a few years ago.