This may be the case for other familiars as well but for the sake of this report it's an Eyeball familiar with no appearance change.
It can speak Deep Speech but cannot understand or translate anything.
It does not convey the ability to understand incoming Deep Speech, whether it is possessed or not possessed.
There is a +0 Search bonus, that's not just a display issue, I'm checking the value before/after summoning it and it stays the same.
On PGCC, when using -familiar to change the appearance of the Eyeball familiar to either Black Cat or Willowisp, they lose the Deep Speech entirely. This might be the case for other familiars as well but I don't really have time to go through and test it all.
The familiar level calculation ia broken for warlock/AA, 10 warlock/10 AA only acquire a familiar around 11 hd, without appearance of the familiar feat.
The skill bonus message could be annoying if your familiar follow you running. Could we get a switch for the alarm or enlarge the area of effect?