One of the benefits of being Marriott Platinum is the Platinum Arrival Gift. This is usually a F&B (food and beverage) amenity such as cheese plate & wine bottle or 500 bonus points. There are some coming changes to this that I wrote about recently (you can access that post here). The F&B choice is likely going away and replaced by $10 credit.
Now, I have spent more than 500 nights at Marriott properties in the past 10 years and I have NEVER been able to collect the Marriott Platinum Arrival Gift guarantee previously (you can read my article about the Marriott guarantees here). Employees seem to be usually rather well trained about this and for a rea$on.