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Hi, I am new to the forum. I just got back from a dig with Paleoadventures. Had a great time! With their digs, you are allowed to keep common fossils (triceratops teeth, bone fragments), but anything commercial (t-rex teeth) must be bought for an additional fee and anything scientifically significant cannot be purchased. I found what was identified to me by the company as a T-Rex tooth. The attached field pics are all that I have at the moment (I have a couple more but it wouldn't let me upload more). I was told that it may cost $1500 to buy. It is being prepped and I will be contacted hopefully by the end of the month following full appraisal. I found this tooth myself in the "tooth draw" site, hell creek formation, South Dakota. I know it is genuine. My question is, how do I know for sure that it is a T-Rex tooth? I don't want to pay a premium price for something that might cost less if it were Albertasaurus or Nanotyrannasaurus or some other tyrannasaurid. What other tyrannasaurids can be found in the hell creek formation that it could be mistaken for? Are there any specific questions or information I should request before purchase? It measured approximately 2 inches long and appears to have serrations. The owner, Walter Stein, has a good resume and seems trustworthy, but I just want to make sure. I've Googled everything I can google and I'm driving myself nuts! Another curiosity....I also found what was explained to me to be a baby T-Rex tooth, but what was ultimately labelled as an "Aubleysodon" tooth. I didn't have the option to buy it because it was considered scientifically significant. Seems there is some debate regarding T-Rex, aubleysodon, and nanotyrannasaurus, regarding whether or not they are separate or the same. I also have a picture of it but couldn't upload. Any input?