Since the Host were dry and in two closed containers, it should be no surprise that the condition was perfect. Unleavened bread has an incredibly long shelf-life. The U.S. Military incorporates similar consumables into its rations.
Hosts usually mold and deteriorate within a week or so because it doesnt have artificial ingredients. It’s likened to the Eucharistic Miracle of Siena in 1730 where the same thing happened.
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