A spore print would be great to have, that way you can start the process of identification.
Identifying Oyster Mushrooms:
◾Oyster shaped cap, hence the name “Oyster mushroom,” usually 2-10 inches across (5-25 cm).
◾Often growing in a shelf-like formation with overlapping caps.
◾Completely smooth tops.
◾Usually white to light silvery-brown top surface, with white gill and stem. The internal flesh is bright white.
◾Decurrent gills, meaning the gills are attached to and running from the cap and down stem.
◾A stem may or may not be present and will be off center of the cap.
◾The spore print is a silvery-gray.
Addendum, even though there are no "oyster mushroom look a likes", it is always a great idea to go through the process of identification since you normally only get one chance to get it right.
If you do an online lookup for "mycologists in my area", you should be able to find an expert close to you.
Pictures can help but for most mushrooms it is better to have hands on the unidentified rather than trying to identify long distance, photos can and have been misleading in the past.
Problems arise because of color differences between the camera, the internet and which computer/ program the observer is using.
Most areas of the USA have local mycology organizations with folks that have the local knowledge to get identifications right, and they usually have field trips both for collecting and learning to identify.