Goto : <world>, <news>, <league transactions>, then look at the 4th drop down <type>

The following type of transactions are among the many sortable :
- BereaveOff
- BearaveOn

- FA 6yr ------ ?!?!?!?!

- RehabOn
- RehabOff

I sorted level, franchise, and timeframe to : ALL - none of the above "types" of transactions show anything for any team, at any level, all season long.

Bereave? Was this supposed to be a mode the user can switch to when experiencing a real life loss and is away from the game?

FA 6yr? I really want to know what this was for

RehabOn/Off ?? There are DLon, DLoff sortables tht work, so I have no idea what rehab is.

Anyone have a clue if these were even part of the game in years past? Were they removed? Explained? Very curious here

I don't think any of those actually 'worked' in the past, although I don't recall trying any myself.
Bereavement Leave is a real thing in MLB. Three days I think?

FA 6yr is for minor league players. After they have accumulated 6 years of experience and are not on the 40-man they will become FA.