My boyfriend and I will be visiting Amsterdam for a week in the second week of May. We plan on spending ~4 days in Amsterdam and 3 days in Den Haag (which would include a visit to Delft and Scheveningen). While in Amsterdam, we will be staying close to Vondelpark for 2 nights and near Rembrandtpark for another 2 nights. Would getting an anonymous OV-chipkaart would be more economical for us than buying the disposable cards?
We also plan on visiting Keukenhof while we are in Amstedam. On the park's website, it said that we can purchase the CombiTickets from Amsterdam in advance for 28€. Since our accommodation is walking distance to the Leidseplein bus station, this looks like a good deal.
My question is, if we buy the CombiTickets now but won't be buying the anonymous OV-chipkaart until after we have arrived at the Amstel bus station, how would that bus fare be transferred onto the OV-chipkaart (e.g. would we show the advance CombiTickets at the counter where we buy the OV-chipkaart and the staff would transfer the amount on the the card?) Unless we just have to show the driver the printout receipts of the CombiTickets and don't have to tap-in and tap-out with the OV-card when we get on bus #197 and bus #858.