When did you purchase yours? Many cars haven't had a service since 2020 due to lockdowns. The example I've shown was sourced at auction probably many of these are Lexus trade in stock not good enough / too slim margin for the forecourt.
Warning : never trust 'service stamps' unless buying from a trusted source!
In my car hunt I've encountered three shifty scenarios :
1. Faked service stamps. Very convincing looking, but a rubber stamp isn't hard to facsimile (even a potato one 😂 ) increasing the resale value of a car by several thousand pounds! Verify with a service dept if possible.
2. Conversely, verified services stamps a Lexus dealership claimed were fraudulent. What happened was the owner previous to the seller knew a Lexus mechanic and had his work done on the side. How do I know this? The seller accidentally revealed the previous owners contact details including phone number, so I called him and he explained this and verified the cars history for me (which I confirmed later, eg he mentioned it had been traded in to Porsche and Porsche acknowledged this and named the person etc). When I explained to this prior owner that Lexus refuted the stamps, he immediately produced a legitimate invoice on official Lexus paperwork showing the service showing costs for parts and nothing for labour. Clearly that branch didn't want to acknowledge that this had occurred.
3. Erroneous 'fake stamp' in service history. With another vehicle, the service dept refuted one of the stamps validity, indicating that the car in question had missed it's major 60k service (sparks etc) and claimed that stamp must be fake. However I contacted the accounts departments who produced an invoice for the work donem which went into great detail. In that case, the information will not have been entered onto the computer system at the point of service.
I guess this is why Mazda and others are going digital..