I've had 4 transactions and 1 merchant credit for 2024 totaling $317.80 in total spend (after subtracting out credit) and have had a single post for 32 MQDs. So they definitely can do some bundling of transactions in posts. Not really clear yet if they will always round up, or if they may round down as well so that it all evens out in the end. I wouldn't bother trying to audit individual MQD posts unless your Amex year-to-date spend (minus merchant credits) happens to be significantly off from year-to-date MQD Boost total posts.