If you are missing your ARKetype engrams, then please try the following steps;
1. Make sure that you are signed in to the same account that made the original purchase.
2. Make sure that you have the latest game update downloaded from the App Store or Google Play Store.
3. Launch ARK: Survival Evolved and navigate to the in-game store.
4. At the bottom of the in-game store, press the Restore Purchases button. Your ARKetype engrams will now be restored, and can be found in the Crafting tab of your inventory.