Sorry to hear this.
Last time I visited USA I arrived home and opened my suitcase to find a note inside saying that my luggage had been opened and inspected by the Transport Security people and giving a disclaimer that they were not liable for any missing items. (I presume they have skeleton keys which let them open and reseal luggage without damage.). Anyway the only thing missing was a highland games programme. Happily another xmarker who had attended the same games was willing to send me a replacement.