Autograph value - Team Signed Helmet

[Luckyirish11]

My daughter and I took an authentic Arizona Diamondbacks helmet to spring training this year and ended up getting the entire team to sign it. I am including it in our home owners insurance, but cannot find any legitimate value. I figured I would post on here to see what everyone else thinks.

Signatures include Paul Goldschmidt, Martin Prado, Miguel Montero, Aaron Hill, Cliff Pennington, Didi Gregorius, Adam Eaton, Jason Kubel, Cody Ross, Gerrardo Parra, AJ Pollock, Erik Chavez, Erik Hinske, Wil Nieves, Rod Barajas, Ian Kennedy, Daniel Hudson, Brandon Mccarthy, Trevor Cahill, Patrick Corbin, Tyler Skaggs, Josh Collmenter, Tony Sipp, Brad Ziegler, David Hernandez, JJ Putz, Matt Reynolds, Heath Bell, Kirk Gibson, Alan Tramell, Don Baylor, Charles Nagy, Derek Hall, Kevin Towers, Ken Kendrick and Bob Brenly.

There are no duplicates and every signature came out clean, used a black sharpie on red helmet. Any guesses welcome, can't find anything online to compare. Thanks.