I've got some red flags going up.
35A is the battery group number (size) and, according to the Optima web site, it's not 35A, just 35. Also, the Optima-specific product number (8020-164) should be somewhere on the battery.
I did some checking on 1stWebSales. Here's what I found on Manta...
1st Web Sales LLC in Aurora, NE is a private company categorized under Business Services (Unclassified). Our records show it was established in and incorporated in Nebraska. Current estimates show this company has an annual revenue of $900,000 and employs a staff of approximately 1.
I also looked at their web page, specifically the Contact Us part. Sorry, but anyone who won't list a phone number in a business as customer-service intensive as auto parts is a complete idiot... or a crook. Also, if you'll look at the page and click on a category (Tools, Batteries, etc) all you get is a "No Products Listed In This Category" message.
By the way, according to a business directory search on their listed physical address, their phone number is (402) 694-9879.
Not to sound negative, but all of this is beginning to add up to something fishy, like maybe they are selling a counterfeited product. How much did your dad pay for the battery? If it was any less than around $145 plus freight then it's definitely a bogus part as $145 is consistently the lowest price I'm finding on the web. A call to Optima (owned by Johnson Controls) should confirm the vendor's "authorized dealer" status.
Edit to add - Their web site designer is an idiot, too. I followed a link to the site designer's web page. Aside from being dull and uninspiring, the dunderhead doesn't give you any way to contact him. None. Not a good idea on a web site that's supposed to entice people to contact you with their business.
Brad