I live in Australia and have never shopped at the 5th Ave Mansion but from my experiences locally, I can say that:
1. Cleaning kit is not automatically provided. You might get a travel pouch and some catalogues/books with your purchase but that’s about it
2. Didn’t even know customers were able to select the serial number (I don’t care about that stuff as long as I’m not getting a display piece lol)
3. Certificate holder should be given but I’ve bought from the online boutique and didn’t get it (the three times I bought in person, it did come with the certificate holder)
4. If you are/plan to drop that kind of money at Cartier you do/should expect a decent level of customer service but for me personally, I do all the research myself before heading into the boutique. I know what I want and the only advice I might need from the SA is in relation to sizing if I am unsure. Ultimately the decision is mine on what I get.
I’ve been to the Melbourne boutiques (Collins Street & Chadstone) a few times (to browse and buy) but have only purchased in store about three times (different SA each time but always pleasant - my first SA was amazing but she stopped working at Cartier) - all my other pieces have been purchased through the online boutique.
I understand you want to establish a relationship with a good SA but if SA 1 isn’t up to your expectations, don’t shop with him anymore (how do they even know you have a track record with him?). I hope you do find a nice SA to work with otherwise try buying online (the packaging is amazing!)