Here are a couple of "information sites" to peruse. BOTH have at least some commercial interest in you so they can not be considered totally unbiased. But, my take is that they are likely on the up/and/up with the information.
https://whitman.com/american-silver-eagles-a-guide-to-the-u-s-bullion-coin-program-4th-edition/
https://atlantagoldandcoin.com/what-you-need-to-know-before-you-sell-silver-eagles/
I have some more questions which you need/might want to answer only for yourself. Why are you buying these Silver Eagles?
To be more specific: Are you collecting them as a "collector." IOW do the coins' beauty or rarity or some other factor make you want to own them? If so, their "value" upon resale is likely less of an issue. Collectors typically wish to look at their coins so your placing them in individual air-tights seems quite appropriate. You shouldn't worry too much about their "value" as you wish to keep them if you are a collector.
Do you wish to make money with your coins? If so, keep in mind that the "rarity" of these coins is currently because a lot of people want to own them - not because they are actually rare. Demand has often outstripped supply, but that was true of Cabbage Patch dolls and Tickle-Me-Elmo. IOW these coins are not, strictly speaking, rare - just hard to get right now in some cases. If that demand should slack as folks move on to the next big "thing," the "value" could plunge. The silver content will not change so melt price will always be a floor for the value of the coins. At a future date, it may well be that people will try to put together collections of these coins and bid them up. But that's not guaranteed. The coins "come" with a high premium over melt price of silver. Recouping that would be difficult with the possible exception of collector-to-collector trading/selling. IOW a coin dealer will likely not pay you what you paid for your coins - at least not for several years yet when the markets possibly shift toward more collecting of the older coins. Something to think about.
Finally, are you collecting them because they are silver and therefore "intrinsically" valuable (due to silver content?) If so, there are cheaper ways to "stack" silver. "Cheap" silver "rounds" are much lower premium above silver melt price. Bars are still cheaper. US coins '64 and older are also cheaper than Silver Eagles though typically (right now) a premium above rounds of similar silver content. Keep in mind that $1.40 face value of USA coinage is roughly one troy ounce of silver. Right now "junk" or "constitutional" or USA coinage is selling around 20 to 22 times the face value of the coin. So a half dollar might cost $0.50 X 21 = $10.50 at a coin shop. At that price, the cost per oz of silver would be about $10.50 X (0.50/1.40) = $29.40 Significantly MORE than a "cheap" one ounce silver round but significantly less than Silver Eagles have been going for of late.
"Preserving wealth" or matching/beating inflation or converting "fiat dollars" to "real money" are often terms silver collectors use. If these are your main reason for owning Silver Eagles, there are cheaper ways to do it. My guess is that your interest is a bit like mine (all the above.
) But the silver I own is MOSTLY the fiat currency/inflation protection argument (Oh, and silver often - but not always is negatively correlated with the stock/bond market.)
Heh, heh, feel free to ignore all this as it may be TMI. OH, and returning you now...