VeposeWomen's 949 Knee High Boots,Tall Riding Boots Low Heel with Wide Calf

Does this arrive in a small box with them folded or a large boot box? I ordered a competitor originally, but the boots arrived creased from being fold

Are the straps removable?

What's the exact opening for a 7.5 size?

What do the numbers 48,49,50 or 51 stand for on description ?