"The necklace has too much value, sentimental and monetary, for me to even consider using it as collateral on something like this.  I'll put up the hundred Valn and my shield generator, provided you let me wear it until we verify that there aren't any automated defenses before turning it over to you.  If you get at least their value worth of salvage from the automated defenses, then you give them back.  If not, you're up one hundred Valn and a working shield generator for, at most, two days worth of work.  I doubt you'll get a better deal than that for protecting anyone else."  True, he didn't have much to put up for collateral, but for most guard types that would be more than enough to hire them.