Based on the information you provided so far, it sounds as if you might have purchased an OEM version of the Seagate ssd. Generally speaking the OEM versions are for retailers who install them in their "off the shelf" computer systems like those sold by Dell, Lenovo, Sony, and others. Sometimes retailers will sell them to consumers.
Typically OEM versions consist of just the bare drive and nothing else. There are no colorful retail boxes, owner manuals, cd-rom installation discs, cables, mounting brackets, screws, migration software, or software & game bundles.
WHOA! Stop! Hold on just a second!
I just visited TigerDirect and Seagate - The spec pages at TigerDirect and Seagate both clearly indicate the Seagate ssd's don't come with anything else. TigerDirect had the information in the video review in the specs section. The TigerDirect reviewer clearly stated Seagate ssd's don't come with anything. However, he did say Seagate does offer extra items and accessories which customers can purchase. The same information is available in the Seagate ssd documents available online. Just for the heck of it I also checked newegg. They are pretty good about clearly identifying OEM products. There's no mention of it being an OEM version and there are no additional items listed. All you get is an ssd in a plain box and a 3 year limited warranty.
I also checked couple of technical reviews listed in the ssd database I maintain. Two reviews mentioned that all you get is an ssd in a plain box.
Bottom line - WYSIWYG.
Just out of curiosity what is the model number and/or part number of your Seagate ssd?