I have 33k inventory (Feel free to do another sale...) and I just traded an entire inv to someone with a 220 MB, but the log only stores the last 100 trades, so only 22k of the trade is visible. While 100x 220 trades is not exactly accessible, there are extensions like: https://gist.github.com/Natsulus/3fb9d105ec9589d05f01743f8c139696#file-farmrpg-minimise-mailbox-log-user-js which compress that down into a single line.
Ideally the log would show just one line for consecutive trades of the same item, but failing that please show more than 100 items so we can do it ourselves. Thanks!