Hi!
Iceland !! Don't believe I ever wrote to anyone in Iceland. Anyway, welcome to the Forum. I'm a relatively new member, but can attest to this place having lots of knowledgeable folks anxious to help out.
Ok, your situation is fairly common. Back in the '40s/'50s, stamp collecting was a major hobby and "everybody" got into it. Now, these early collectors (I'm one of them) are up in years and many collections are up for sale. To compound the situation, relatively few folks are taking up the hobby. Soooo, supply well exceeds demand, yielding low market prices.
That's the reason I jumped back into the hobby, for I could build collections for minimal bucks. In the process, I have bought 6 albums off of
ebay for less money than I could have imagined years ago.
For the most part, your stamp packets are not all that valuable. In fact, the entire collection may be worth significantly less that you expect. Check out
ebay, starting with looking up the album(s) you have and see what they are going for. Most of their worth is based on the number of stamps included, with maybe 3 to 5 cents per stamp being the ultimate selling price.
As a ballpark, take the price your stamp dealer offered you and multiply by 4. That would give you an idea as to what to expect on
ebay.
Ok, it is possible you have some "winners" there. But they will likely not be found in stamp packets. Take a pic of the older condition stamps and post it on the forum, and folks will advise value.
Scotts does put out catalogues for various countries, and that will give you a value - but it is a very high value for the most part.
Sorry for the disappointment, but that is the way it is.