At the home of a trusted friend or family member, ask him or her to keep the gifts, especially if you are going to buy large gifts, such as a bicycle or a cart.
If your car has a trunk with a lid, hide them, this does not work if your trunk can be seen from the window or the back seat.
If you feel comfortable hiding the toys in your office, try it, your children would never find them there. If your office is at home, do not hide them there, it is a place where they will surely search.
Use your kitchen, inside pots or boxes of some food that they do not consume frequently.
Basements or attics are very good ideas for keeping gifts, since they are places that children rarely visit.
Hide them in full view, buy cardboard boxes and label them with boring names, for example: "bills" or "history books", although it is not the safest place, it is unlikely that you will be tempted to open these boxes.