Nice to see a tool popup for this. Those addresses host an incredibly huge amount of Bitcoins. I'm not sure if according to that reddit post all the addresses really belong to the MTGox trustee or by other parties. There are very few comments on that post as well and can't make out much from the 2 transactions. It could be payments made to others back in 2014 and they probably could never be moved. Could you let me know if you have any other sources for those addresses?

To add - There's also another reddit post about a "mismanaged" address from the MtGox website but there's no authenticity of a source to validate this claim - https://www.reddit.com/r/Bitcoin/comments/82twi2/want_to_hunt_down_430k_btc_from_mtgox_here_is_the/

Edit: Maybe we need to try and addup the values from all those addresses to check if it is near the value of the one mentioned here - https://www.mtgox.com/img/pdf/20180307_report.pdf